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IEEE Access > 2017 > 5 > 480 - 500
2010 International Conference on Educational and Information Technology > 1 > V1-173 - V1-175
2010 2nd International Conference on Education Technology and Computer > 1 > V1-216 - V1-218
IEEE Transactions on Education > 2008 > 51 > 1 > 138 - 144